First of all this occured when the electricity went off one day. I had my computer connected to a ups and a safety power hub but i didnt manage to shut it down before the battery of the ups went off so it forced closed on its own. After that the led of the power supply, not the one on the psu but the one which is located in the chassis in front where the hdd led is as well, started flashing and the computer wont start at all. I started turning off and on the power supply button on the psu and i could hear a noise not a loud one like the one you get with a ram or w/e problem but a silent "" vzzzz" thinky. After multiples swith off and on from the psu button the sound stoped and the pc started. However when i shut it down again the noise is there again and now i cant start it again. Now i want to buy a new psu in order to fix the issue but i am not 100% sure if it's the psu's failure. Any ideas if it's the psu or something else?